import java.util.ArrayList;
import java.util.Scanner;
public class StudentSystem {
    public static void main(String[] args) {
        ArrayList<Student> list = new ArrayList<>();
        loop:
        while (true) {
            System.out.println("-------------------------欢迎来到学生管理系统-----------------------");
            System.out.println("1:添加学生");
            System.out.println("2:删除学生");
            System.out.println("3:修改学生");
            System.out.println("4:查询学生");
            System.out.println("5:退出");
            System.out.println("请输入您的选择");
            Scanner sc = new Scanner(System.in);
            String choose = sc.next();
            switch (choose) {
                case "1":
                    addStusent(list);
                    break;
                case "2":
                    deleteStusent(list);
                    break;
                case "3":
                    updateStusent(list);
                    break;
                case "4":
                    queryStusent(list);
                    break;
                case "5":
                    System.out.println("退出");
                    break loop;
                default:
                    System.out.println("没有这个选项");
            }
        }
    }

    public static void addStusent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入学生的id");
        String id = sc.next();

        System.out.println("请输入学生的姓名");
        String name = sc.next();

        System.out.println("请输入学生的年龄");
        int age = sc.nextInt();

        System.out.println("请输入学生的家庭住址");
        String address = sc.next();

        Student s = new Student(id, name, age, address);

        list.add(s);
    }

    public static void deleteStusent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入要删除的id");
        String id = sc.next();
        int Index = getIndex(list, id);
        if (Index >= 0) {
            list.remove(Index);
            System.out.println("id为：" + id + "的学生删除成功");
        } else {
            System.out.println("id不存在，删除失败");
        }
    }

    public static void updateStusent(ArrayList<Student> list) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入要修改学生id");
        String id = sc.next();

        int Index = getIndex(list, id);
        if (Index == -1) {
            System.out.println("要修改的id" + id + "不存在，请重新输入");
            return;
        }
        Student stu = list.get(Index);

        System.out.println("请输入要修改的学生姓名");
        String newname = sc.next();
        stu.setName(newname);

        System.out.println("请输入要修改的学生年龄");
        int newage = sc.nextInt();
        stu.setAge(newage);

        System.out.println("请输入要修改的家庭住址");
        String newAddress = sc.next();
        stu.setAddress(newAddress);

        System.out.println("学生信息修改成功");

    }

    public static void queryStusent(ArrayList<Student> list) {
        if (list.size() == 0) {
            System.out.println("当前无学生信息，请添加后再查询");
            return;
        }

        System.out.println("id\t\t姓名\t年龄\t家庭住址");
        for (int i = 0; i < list.size(); i++) {
            Student stu = list.get(i);
            System.out.println(stu.getId() + "\t" + stu.getName() + "\t" + stu.getAge() + "\t" + stu.getAddress());
        }
    }



    public static int getIndex(ArrayList<Student> list, String id) {
        for (int i = 0; i < list.size(); i++) {
            Student stu = list.get(i);
            if (stu.getId().equals(id)) {
                return i;
            }
        }
        return -1;
    }
}